On Tue, Feb 13, 2018 at 2:53 AM, Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > On 02/12/2018 05:41 PM, Masahiro Yamada wrote: >> 2018-02-13 8:48 GMT+09:00 Randy Dunlap <rdunlap@xxxxxxxxxxxxx>: >>> On 02/12/2018 07:24 AM, Kees Cook wrote: >>>> On Mon, Feb 12, 2018 at 6:39 AM, Masahiro Yamada >>>> <yamada.masahiro@xxxxxxxxxxxxx> wrote: >>> >>>>>> (And in thinking about this, does Kconfig know the true $CC in use? >>>>>> i.e. the configured cross compiler, etc?) >>>>> >>>>> I was thinking of removing CONFIG_CROSS_COMPILE. >>>>> >>>>> A user can dynamically change CROSS_COMPILE from >>>>> "make menuconfig". >>>> >>>> Most builds I've seen implement cross compilers as an environment >>>> variable during all "make" invocations. >>> >>> I agree. I think you would break a bunch of build bots if you remove that. >> >> >> For clarification, I suggested to remove CONFIG_CROSS_COMPILE. >> >> The following code: >> https://github.com/torvalds/linux/blob/v4.16-rc1/Makefile#L315 >> https://github.com/torvalds/linux/blob/v4.16-rc1/init/Kconfig#L58 >> >> I hope build bots are not using this. >> >> >> Passing CROSS_COMPILE via the command line, environment >> is still supported. > > OK, I misunderstood. That one can go away IMO. Removing it will break the workflow for some people in a minor way though. Could we have the top-level Makefile try to detect the CROSS_COMPILE? Instead of just using CC=gcc as the default, we could check for ${ARCH}!=`uname -m` and then see if $PATH contains a ${ARCH}-linux-gcc, ${ARCH}-elf-gcc or ${ARCH}-gcc. it will need slightly more complexity to deal with architectures that have different identifiers in linux and gcc, but I think it would be a nice feature anyway. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
